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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b989522c27e8e8a6414417909e345769996b2d8e42bbf25e29bbe8a58cdd9e57' 
  AND token = 'ECQ0eEEsU57rOGklDjkGxVDC9MpDkt51s7e+Hdb9u/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}